Internal-combustion engine



. Nov. 13, 1928.

W. F. SMITH INTERNAL COMBUSTION ENGINE Original Filed May 23. 1924 UM Z M mm 0M 5 m 8AA P3.

Patented Nov. 13, 1928.

UNITED STATES 7 1,691,616 PATENT OFFICE.

WILLIAM F. SMITH, OF POUGHKEEPSIE, NEW YORK, ASSIGNOR OF ONE-HALF TO HERMAN A. SCHATZ, OF POUGI'IKEEIE-SIE, NEW YORK.

INTERNAL-COMBUSTION ENGINE.

Original application filed May 23, 1924, Serial No. 715,388. Divided and thisapplication filed January 12,

This invention relates to improvements in internal combustion engines, and particularly to gasoline engines of the so-called air cooled type. This is a division of my co pending application Serial No, 715,338, filed May 23, 1924-.

The invention is disclosed as applied to a one-cylinder gasoline engine particularly adapted for use in tractors and the like, Obviously, the various features are readily applicable to internal combustion engines of widely varying types without departing from the spirit of the present invention.

In the drawings Fig, 1 is a vertical crosssection of as much of a gasoline engine as is necessary for an understanding of the various features of the present invention; and Fig 2 is a plan view of casting (131) The engine is mounted on a casting 131 which constitutes also the base plate of the air cleaner. Attached to the cast-- ing 131 is a plate 130, The cylinder 1 is bolted to this casting 131 at 132, 133. 134 and 135. he two push rods extend through perforations 138 and 139 in the casting 131. The casting is provided with ridges forming substantially two parallelograms 140 and 141 interconnected by means of a narrow ridge 142, and ridges 143 and 14-4 terminating in a' point 145 midway between the channel 205 formed by 140 and'141. A plate 146 is fastened to the casting 131 by means of screws 147 engaging the ridges. The plate extends to the cylinder and is provided with two perforations 148 and 149. The plate 146 is raised around the perforation 149 to form a neck 150 on which fits pipe 151. The opening 148 coincides withan opening 153 in a casting 154 on which is mounted at 155 a blower 156 suitably carried in ball bearings and driven by means of a belt from the crankshaft or other suitable source a When the engine is operating air drawn in by the blower 156 is streaming into the channels 203, 204, and then turns at right angles into the channel 205 and through 153 into the outside atmosphere. Part of the air drawn through channel 205 will be (,iverted up through the pipe 151, owing to the suction exerted by the descending piston Inasmuch as the passage of air from the outer atmosphere through 205 and then 151 is interrupted at substantially right angles,

Serial No. 1,902.

hard particles such as sand that might be suspended in the air will, by their own 1110- menturn, continue to travel, drawn by the suction of the blower through channel 205 and Such hard particles are aided in their tendency to travel through the channel 205 by the fact that the channel 153 is tapering, whereby it acts as a Venturi tube and accelerates the movement of such heavy particles. This arrangement constitutes an air cleaner which, without the use of any screens, felt pads or the like, that need. con stant cleaning and adjustment, insures that air deprived of all hard gritty substances that might injure the cylinder walls, pass through the tube 151. Light particles, such as scraps of grass that might be drawn through 151, will of course, be destroyed by combustion and cannot, at any event, injure the cylinder.

What I claim is:

1. In an internal combustion engine having an air intake, a casting for supporting an engine cylinder, a plurality of raised portions on said casting and a cover plate cooperating therewith whereby a plurality of ducts are formed, a first duct opening to the atmosphere, means whereby air is caused to flow rapidly through said first duct and a passageway interconnecting with said first duct substantially at right angles thereto and also interconnecting with said air intake whereby air passed to said intake is freed from dirt 2. In an air cleaner for an internal coinbustion engine having a carburetor, a fan for cooling said engine, a housing member enclosing moving engine elements and coirprising a pluralty of air passageways, a first passageway opening to the atmospher and a second passageway opening at one end to the atmosphere adjacent to said fan so that the fan will draw air through said passageway and at the other end interconnecting with said tirst passageway substantially at right angles thereto and a passageway leading to said carburetor and interconnecting with said second passageway substantially at right angles thereto.

in testimony whereof, I have signed my name to this specification this 3rd day of January, 1925.

WILLIAM E SMITH 

